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Lithium-ion secondary battery and its electrolyte

A secondary battery and electrolyte technology, applied to secondary batteries, circuits, electrical components, etc., can solve the problems of deteriorating charging performance, cycle performance, and large impedance of lithium-ion secondary batteries, and achieve improved cycle performance and low-temperature charging performance, reduction of interfacial impedance, and suppression of reductive decomposition

Active Publication Date: 2017-12-26
DONGGUAN AMPEREX TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, most of the SEI films formed by these additives on the surface of the negative electrode have a dense structure and high impedance, which will deteriorate the charging performance and cycle performance of lithium-ion secondary batteries at low temperatures.

Method used

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  • Lithium-ion secondary battery and its electrolyte
  • Lithium-ion secondary battery and its electrolyte
  • Lithium-ion secondary battery and its electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Preparation of positive electrode sheet: Lithium cobalt oxide, conductive agent SuperP, and binder PVDF are mixed uniformly at a mass ratio of 96:2.0:2.0 to make a certain viscosity lithium ion secondary battery positive electrode slurry, which is coated on the current collector aluminum foil. Its coating weight is 0.0194g / cm 2 , after drying at 85°C, cold pressing; then trimming, cutting, and slitting, drying at 85°C for 4 hours under vacuum conditions, welding the tabs, and making a lithium-ion secondary battery positive electrode that meets the requirements piece.

[0026] Preparation of negative electrode sheet: graphite, conductive agent SuperP, thickener CMC, and binder SBR are made into a slurry at a mass ratio of 96.5:1.0:1.0:1.5, coated on the current collector copper foil and baked at 85°C Dry, the coating weight is 0.0089g / cm 2 ; After trimming, cutting, and slitting, dry at 110° C. for 4 hours under vacuum conditions, and weld the tabs to make a lithium-io...

Embodiment 2

[0030] The lithium ion secondary battery was prepared with reference to the method of Example 1, except that the compound represented by general formula (4) was used instead of the compound represented by general formula (3) in Example 1 when preparing the lithium ion secondary battery electrolyte.

Embodiment 3

[0032] The lithium ion secondary battery was prepared with reference to the method of Example 1, except that the compound represented by general formula (9) was used instead of the compound represented by general formula (3) in Example 1 when preparing the lithium ion secondary battery electrolyte.

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Abstract

The invention discloses electrolyte of a lithium ion secondary battery. The electrolyte comprises lithium salt, a non-aqueous organic solvent and an additive, wherein the additive at least comprises a compound reflected by the general formula (1) shown in the specification; in the general formula (1), n is an integer from 0 to 2; R1 and R2 are C1-C3 alkyl; R3 is a hydrogen atom or C1-C3 alkyl. Furthermore, the invention also discloses the lithium ion secondary battery adopting the electrolyte. The compound reflected by the general formula (1) can form a good protection film on the surface of a polar plate, and the protection film can effectively improve a negative / electrolyte interface, suppress the reductive decomposition of the electrolyte on the negative surface and also reduce the interface impedance between the polar plate and the electrolyte, so that the cycle performance and the low-temperature charging performance of the lithium ion secondary battery are improved.

Description

technical field [0001] The invention belongs to the field of lithium-ion secondary batteries, more specifically, the invention relates to a lithium-ion secondary battery with good low-temperature charging performance and cycle performance and an electrolyte thereof. Background technique [0002] Lithium-ion secondary batteries have the advantages of high working voltage, long life and fast charging speed. However, with the continuous development of technology and users' demand for fast use of electronic products, people hope that lithium-ion secondary batteries have better cycle performance. , At the same time, it is also required that the lithium-ion secondary battery can be charged quickly at a lower temperature. [0003] Lithium-ion secondary batteries generally use cyclic carbonates and linear carbonates as electrolyte solvents. However, the above-mentioned solvents will continuously undergo redox reactions during battery charging and discharging, resulting in low initia...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567Y02E60/10
Inventor 褚春波付成华吴凯韩昌隆王阿忠叶士特
Owner DONGGUAN AMPEREX TECH
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